/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlinePartyInterface.h
Cancel an invitation sent to a user
void CancelInvitation ( const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) & LocalUserId, const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) & TargetUserId, const [FOnlinePartyId](API\Plugins\OnlineSubsystem\FOnlinePartyId) & PartyId, const [FOnCancelPartyInvitationComplete](API\Plugins\OnlineSubsystem\Interfaces\FOnCancelPartyInvitationComplete) & Delegate )